virtio-gpu: add locking for vbuf pool
authorDave Airlie <airlied@redhat.com>
Tue, 16 Jun 2015 05:42:13 +0000 (15:42 +1000)
committerGerd Hoffmann <kraxel@redhat.com>
Tue, 16 Jun 2015 09:22:41 +0000 (11:22 +0200)
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
drivers/gpu/drm/virtio/virtgpu_drv.h
drivers/gpu/drm/virtio/virtgpu_vq.c

index ff8de3d6f0b22450dcd0825c5b93cd112b42d0fd..6d4db2dba90b2f8757fda75dc43a2f69eb6e44d8 100644 (file)
@@ -162,6 +162,7 @@ struct virtio_gpu_device {
        struct virtio_gpu_queue ctrlq;
        struct virtio_gpu_queue cursorq;
        struct list_head free_vbufs;
+       spinlock_t free_vbufs_lock;
        void *vbufs;
        bool vqs_ready;
 
index c5067926401fb4c9ddeaf7cf35166a5e915233fa..1698669f4185747ce3ce51f1d933c8668ee5c726 100644 (file)
@@ -79,6 +79,7 @@ int virtio_gpu_alloc_vbufs(struct virtio_gpu_device *vgdev)
        void *ptr;
 
        INIT_LIST_HEAD(&vgdev->free_vbufs);
+       spin_lock_init(&vgdev->free_vbufs_lock);
        count += virtqueue_get_vring_size(vgdev->ctrlq.vq);
        count += virtqueue_get_vring_size(vgdev->cursorq.vq);
        size = count * VBUFFER_SIZE;
@@ -106,6 +107,7 @@ void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev)
        count += virtqueue_get_vring_size(vgdev->ctrlq.vq);
        count += virtqueue_get_vring_size(vgdev->cursorq.vq);
 
+       spin_lock(&vgdev->free_vbufs_lock);
        for (i = 0; i < count; i++) {
                if (WARN_ON(list_empty(&vgdev->free_vbufs)))
                        return;
@@ -113,6 +115,7 @@ void virtio_gpu_free_vbufs(struct virtio_gpu_device *vgdev)
                                        struct virtio_gpu_vbuffer, list);
                list_del(&vbuf->list);
        }
+       spin_unlock(&vgdev->free_vbufs_lock);
        kfree(vgdev->vbufs);
 }
 
@@ -123,10 +126,12 @@ virtio_gpu_get_vbuf(struct virtio_gpu_device *vgdev,
 {
        struct virtio_gpu_vbuffer *vbuf;
 
+       spin_lock(&vgdev->free_vbufs_lock);
        BUG_ON(list_empty(&vgdev->free_vbufs));
        vbuf = list_first_entry(&vgdev->free_vbufs,
                                struct virtio_gpu_vbuffer, list);
        list_del(&vbuf->list);
+       spin_unlock(&vgdev->free_vbufs_lock);
        memset(vbuf, 0, VBUFFER_SIZE);
 
        BUG_ON(size > MAX_INLINE_CMD_SIZE);
@@ -201,7 +206,9 @@ static void free_vbuf(struct virtio_gpu_device *vgdev,
        if (vbuf->resp_size > MAX_INLINE_RESP_SIZE)
                kfree(vbuf->resp_buf);
        kfree(vbuf->data_buf);
+       spin_lock(&vgdev->free_vbufs_lock);
        list_add(&vbuf->list, &vgdev->free_vbufs);
+       spin_unlock(&vgdev->free_vbufs_lock);
 }
 
 static void reclaim_vbufs(struct virtqueue *vq, struct list_head *reclaim_list)